中国先进研究堆工程科学应力谱仪性能优化与刻度研究  

Performance Optimization and Calibration of Engineering and Scientific Stress Diffractometer at China Advanced Research Reactor

作　　者：田庚方[1] 刘晓龙[1] 余周香[1] 李眉娟[1] 李玉庆[1] 刘蕴韬[1] 孙凯[1] 陈东风[1] TIAN Gengfang;LIU Xiaolong;YU Zhouxiang;LI Meijuan;LI Yuqing;LIU Yuntao;SUN Kai;CHEN Dongfeng(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《原子能科学技术》2024年第7期1588-1593,共6页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2020YFA0405902);国家自然科学基金面上项目(12075321)。

摘　　要：为充分发挥中国先进研究堆工程科学应力谱仪在工程构件残余应力表征的作用,在常用金属测试所需的中子波长约0.164 nm下进行谱仪的性能优化和刻度研究。在此波长下,将Fe(211)衍射峰的峰位误差作为光路优化的品质因数,通过调整单色器的水平聚焦和垂直聚焦姿态,获得了最优性能的聚焦光路。采用金箔活化法测试了样品处中子注量率,在反应堆满功率60 MW的条件下,样品处中子(波长0.164 nm)注量率为3.0×10^(7)cm^(−2)·s^(−1)(±4.5%),在衍射角约90°的分辨率为0.42%。使用带缝隙的镉片测试了探测器的位置分辨,获得探测器水平方向的位置分辨为(1.44±0.03)mm。本工作完成了谱仪的光路优化与性能刻度,为谱仪投入运行奠定了实验基础。Residual stress is a key factor that directly affects fatigue,stress corrosion,fretting wear and other performance of engineering materials and components.However,it is difficult to accurately obtain the distribution of the deep residual stress field of the components using theoretical analysis and traditional non-destructive testing methods,which greatly hinders the development of advanced components.Due to the high penetration ability of thermal neutrons,neutron diffraction is an excellent engineering tool for providing mapping of residual stresses nondestructively in bulk components.Therefore,neutron diffraction was the most suitable non-destructive technique to characterize the deep residual stresses distribution.Therefore,National Important Project on Scientific Instrument and Equipment“the Neutron Diffractometer for Residual Stress and Defect in Materials and Components”was funded to built Engineering and Scientific Stress Diffractometer at China Advanced Research Reactor(CARR),which will serve the development of national important equipments,provide testing technique for manufacturing process of large-scale component and accumulate technical data for new material design.In order to fully play the role of Engineering and Scientific Stress Diffractometer in residual stress characterization of the engineering components,the mostly used crystal planes and the required wavelength for diffraction angle of about 90°of steel,nickel,copper,aluminum and titanium were analyzed.Thus,the optimal wavelength of the diffractometer was chosen to be around 0.164 nm,which satisfies the residual stress measurement for most commonly used metal materials.With this wavelength,the error of Fe(211)diffraction peak position was used as figure of Merit for the optics optimization.Optimized optics was obtained by tuning the horizontal and vertical focusing parameters.The neutron flux at the sample position that measured at the optimized optics with wavelength of 0.164 nm is a key parameter for the intensity performance of diffra

关 键 词：工程科学应力谱仪 中子衍射 残余应力 光路优化 样品处中子注量率 

分 类 号：TL99[核科学技术—核技术及应用] O571.56[理学—粒子物理与原子核物理]